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Shell dissolution state of the thecosome pteropod Limacina helicina antarctica during Polarstern cruise PS111 (ANT-XXXIII/2)

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Bibliographic Details
Title: Shell dissolution state of the thecosome pteropod Limacina helicina antarctica during Polarstern cruise PS111 (ANT-XXXIII/2)
Authors: Lischka, Silke, Bach, Lennart Thomas, Csenteri, Katharina, Gorb, Stanislav N, Konschak, Sonja, Michels, Jan
Publisher Information: PANGAEA
Publication Year: 2024
Collection: PANGAEA - Data Publisher for Earth & Environmental Science (AWI Bremerhaven / MARUM Bremen)
Subject Terms: Antarctica, ANT-XXXIII/2, aragonite saturation state, biomass/elemental composition, BONGO, Bongo net, carbonate system, Comment, Date/Time of event, DEPTH, water, Description, Device type, Event label, File name, File type, Image, specimens, specimens (File Size), specimens (Media Type), Latitude of event, Longitude of event, Magnification, mesozooplankton, Method/Device of event, Number, Ocean acidification, Polarstern, Presence/absence, PS111
Subject Geographic: MEDIAN LATITUDE: -76.182309 * MEDIAN LONGITUDE: -40.418798 * SOUTH-BOUND LATITUDE: -77.898090 * WEST-BOUND LONGITUDE: -60.796031 * NORTH-BOUND LATITUDE: -73.699743 * EAST-BOUND LONGITUDE: -25.729409 * DATE/TIME START: 2018-02-03T02:24:00 * DATE/TIME END: 2018-02-25T10:36:00 * MINIMUM DEPTH, water: 2 m * MAXIMUM DEPTH, water: 500 m
Description: At high latitudes, thecosome pteropods (marine pelagic mollusks) can dominate zooplankton communities and are important food web components. Due to their calcium carbonate shell made of aragonite, they significantly contribute to ocean carbon flux and are particularly vulnerable to ocean acidification. Aragonite undersaturation (Ωar < 1) events are projected to rapidly increase in frequency and duration in the Antarctic Weddell Sea by 2050 due to uptake of increasing amounts of anthropogenic CO2. This potentially perils thecosomes by inducing shell dissolution. The project aim was to describe the importance of thecosome pteropods in terms of their biomass contribution relative to that of other mesozooplankton groups in the Weddell Sea pelagic ecosystem and to describe the current shell dissolution state of thecosome pteropods in relation to prevailing ocean carbonate chemistry conditions as a benchmark for possible future monitoring of ongoing ocean change processes. This dataset includes the shell dissolution assessment performed on scanning electron microscopy (SEM) pictures of individual thecosome pteropod specimen of the species Limacina helicina antarctica. It also includes accompanying overview pictures of the pteropods taken prior to SEM analysis with a stereomicroscope. Total dissolution severity was assessed based on the occurrence of three severity types of dissolution (Type I, Type II, Type III) on the surface of the protoconch and first two whorls of the individual shells. Along with the dataset individual SEM pictures of each shell (overview and close-ups of the 2nd whorl, 1st whorl and the protoconch) are provided. Individual Pteropods were usually collected from 500–0 m depth during PS111 at the eastern Weddell Sea Shelf and the Filchner-Ronne ice shelf.
Document Type: dataset
File Description: text/tab-separated-values, 7165 data points
Language: English
Relation: Lischka, Silke; Michels, Jan; Bach, Lennart Thomas; Csenteri, Katharina; Konschak, Sonja; Gorb, Stanislav N (2025): Pteropods as early-warning indicators of ocean acidification. Limnology and Oceanography, lno.70079, https://doi.org/10.1002/lno.70079; https://doi.pangaea.de/10.1594/PANGAEA.966222; https://doi.org/10.1594/PANGAEA.966222
DOI: 10.1594/PANGAEA.966222
Availability: https://doi.pangaea.de/10.1594/PANGAEA.966222
https://doi.org/10.1594/PANGAEA.966222
Rights: CC-BY-4.0: Creative Commons Attribution 4.0 International ; Access constraints: unrestricted ; info:eu-repo/semantics/openAccess
Accession Number: edsbas.FDC43D8E
Database: BASE
Description
Abstract:At high latitudes, thecosome pteropods (marine pelagic mollusks) can dominate zooplankton communities and are important food web components. Due to their calcium carbonate shell made of aragonite, they significantly contribute to ocean carbon flux and are particularly vulnerable to ocean acidification. Aragonite undersaturation (Ωar < 1) events are projected to rapidly increase in frequency and duration in the Antarctic Weddell Sea by 2050 due to uptake of increasing amounts of anthropogenic CO2. This potentially perils thecosomes by inducing shell dissolution. The project aim was to describe the importance of thecosome pteropods in terms of their biomass contribution relative to that of other mesozooplankton groups in the Weddell Sea pelagic ecosystem and to describe the current shell dissolution state of thecosome pteropods in relation to prevailing ocean carbonate chemistry conditions as a benchmark for possible future monitoring of ongoing ocean change processes. This dataset includes the shell dissolution assessment performed on scanning electron microscopy (SEM) pictures of individual thecosome pteropod specimen of the species Limacina helicina antarctica. It also includes accompanying overview pictures of the pteropods taken prior to SEM analysis with a stereomicroscope. Total dissolution severity was assessed based on the occurrence of three severity types of dissolution (Type I, Type II, Type III) on the surface of the protoconch and first two whorls of the individual shells. Along with the dataset individual SEM pictures of each shell (overview and close-ups of the 2nd whorl, 1st whorl and the protoconch) are provided. Individual Pteropods were usually collected from 500–0 m depth during PS111 at the eastern Weddell Sea Shelf and the Filchner-Ronne ice shelf.
DOI:10.1594/PANGAEA.966222